Notes Conversation View

One of the many innovations, brought to me by Gmail, is the conversation view, what means, that mails with the same subject will be shown as a conversation and thus you will get all your mails for a conversation just by scrolling your window down.
With Lotus Notes 8 IBM brought this idea into Notes. It requires at least a Lotus Domino 8 Server and an update of your mail database to the Notes 8 template. Than you can activate it by selecting conversation from the show menu at the top right corner of your mail view.
After opening a mail, you can select conversation from the display menu on top of your mail. This brings a list of all mails, which belong to the same conversation, to the top of your mail and you can open them by double clicking it. This is not as comfortable and cool like in Gmail, but you'll get a quick way to open other mails from the conversation.
But one thing I don't understand is this conversation list. It has a fixed size. If you've got just one mail in your conversation, you'll have a big free area on top of your screen. That's not very efficient.
On my MacBook with this small wide screen it takes a lot space, like you can see: